class_docstr: Cache stores downloaded objects, notably apache-rat.jar. 
docstr: Return the full path of a key. 
docstr_tok: ["Return","the","full","path","of","a","key","."]
code: def key_path(self, key):
      """Return the full path of a key."""
      return self.root / key
  
file_path: arrow/dev/archery/archery/utils/cache.py
imports: from pathlib import Path
  import os
  from urllib.request import urlopen
  from .logger import logger
label_desc: Use image node_id 2 for calling the Cache obj's underlying member method code with example usage: obj.key_path(key) and returns: unknown